Minister for the Environment and Water Resources Vivian Balakrishnan had said on Monday that this is a cause for concern as it affects Singapore's ability to draw its full 250 million gallons entitlement from Malaysia's Johor River.

In his post, PM Lee added that he visited the Linggiu Reservoir in 2012. He said he decided to build more Newater and desalination plants thereafter to "make our water supply more resilient".

He added that another Newater plant will be completed next year, and a third desalination plant in 2017.

PM Lee wrote: "In Singapore, water will always be a precious resource. Never take it for granted, or waste it. Please do your part to conserve water."

The Straits Times

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